Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

1996-06-03

1997-12-02

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333193, H03H 964

Patent

active

056940963

ABSTRACT:
A surface acoustic wave (SAW) filter includes a plurality of interdigital transducers located on a piezoelectric substrate along a surface wave propagation direction, at least a single one-port SAW resonator connected in series with an output side of the SAW filter, while the resonance frequency of the SAW resonator is set at a level which is higher than the passband of the SAW filter.

REFERENCES:
patent: 4166258 (1979-08-01), Tseng
patent: 4492940 (1985-01-01), Hikita et al.
patent: 4542356 (1985-09-01), Nakazawa et al.
patent: 4734664 (1988-03-01), Hikita et al.
patent: 5010269 (1991-04-01), Hikita et al.
patent: 5115216 (1992-05-01), Hikita et al.
patent: 5202652 (1993-04-01), Tabuchi et al.
patent: 5204575 (1993-04-01), Kanda et al.
patent: 5223762 (1993-06-01), Masaie et al.
patent: 5521453 (1996-05-01), Yatsuda
"IEEE Transactions on Microwave Theory and Techniques", Hikita et al. Minature Saw Antenna Duplexer for 800 MHz Portable Telephone Used In Cellular Radio Systems. vol. 36, No. 6 Jun. 1988.
Co-pending U.S. Patent Application No. 08/272151 English Translation of Japanese Patent 52-109044.

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